Dynamic Binding is a concept that applies to Object Oriented Programming. C is not object oriented.

What is it you're trying to do... explain more and maybe we can give you some ideas

There are function pointers in c, using which you can create structures which a similar to objects in c++, but not all concepts of c++ apply to c.

Objective-C is a language based upon C, with a few additions that make it a complete, object-oriented language.
Objective-C is a language that implements true dynamic binding (which is required for a language to be truly object-oriented). This means that messages sent to an object aren't bound to a specific function implementation in a specific class until the program is actually run. Stating this another way, the programmer does not know how an object will react to a specific message until the program is actually run.